https://github.com/peterrum/in2012-ws3-allreduce

https://github.com/peterrum/in2012-ws3-allreduce

Last synced: about 1 year ago
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• Host: GitHub
• URL: https://github.com/peterrum/in2012-ws3-allreduce
• Owner: peterrum
• Created: 2016-11-14T16:52:08.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2016-12-03T13:47:56.000Z (over 9 years ago)
• Last Synced: 2025-01-20T19:52:28.632Z (over 1 year ago)
• Language: C++
• Size: 177 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Objectives

Basic implementations of MPI_Reduce and MPI_Allreduce. Changes:

# Running

After building with CMake run the program with the following command:

``` bash

$ mpirun -np 4 ./main

``` 

with 

* 4 being the number of MPI-processes (np) - it has to be a power of 2. 

# Algorithm

![alt tag](images/reduce.png "Description goes here")

For an implementation for processor counts not equal power of 2 (asymetrical tree) see:

* [https://github.com/peterrum/in2012-ws3-allreduce-sequential](https://github.com/peterrum/in2012-ws3-allreduce-sequential)

* [https://github.com/peterrum/in2012-ws3-allreduce-asymetricaltree](https://github.com/peterrum/in2012-ws3-allreduce-asymetricaltree)